A.By the way, when is the final? |
B.That would be nice! |
C.We have just won a game. |
D.Thanks, Cindy. |
E.What about next Tuesday? |
F.Maybe you can talk with your teammates about that. |
G.What should I do? |
Face to the Sunshine
“Keep your face to the sunshine and you cannot see the shadows” is a popular saying. It encourages people to make the best of a situation, to see the “bright side” of things. It calls attention to the way sunflowers follow the sun during the day. People have known about this phenomenon (现象) for a long time. Recently scientists have discovered how this works. They know why sunflowers keep their “faces” to the sunshine.
Sunflowers move and respond to their environment. These flowers actually face the sun as it rises in the east and follow it as it moves across the sky until it sets in the west. Just like people, these flowers depend on the daily rhythms (节奏) of the day and night. Both the sunflowers and human beings wake up in the morning, follow the sun all day and then rest at night.
During the day, young sunflower plants track the sun from east to west. The green flower head turns towards the sun. At night, the young plants turn east waiting for the sun to rise in the morning. Adult sunflowers don’t move. Once the flower is open, it faces only east. Scientists have discovered that this movement and lack of movement has to do with uneven (不均匀的) growth in the plant stems. One side of the stem gets bigger during the day, and at night the other side gets bigger. Certain genes (基因) control this growth. They respond to the light and cause the flowers to turn to face the sun.
Scientists have found that young sunflowers that follow the sun have more biomass (生物量) —that means that they get bigger. Adult plants facing the east get warmer. That in turn attracts more bees and other insects that will help pollinate(授粉) the plant. This means that the plant can produce seeds and has a better chance of reproducing.
1.The material above is a news report, isn’t it?A.look up to | B.look up | C.look through | D.look like |
A.Both, another | B.Both, the other | C.Neither, another | D.Neither, the other |
A.by | B.at | C.in | D.since |
excited, live, Last, took, with, engineer |
Hi, I’m Zhang Peng. I’m 12. I
“Poor Grandma! I wish we could do something to cheer her up.” Amy said to her brother Mark.
Grandma had fallen and broken her
“I have a(n)
Amy agreed,
First, they put some drainage material(排水材料)at the bottom of the bottle. This would keep the soil(土壤)from getting too
Now they were ready to add the plants. Amy had chosen
When Amy and Mark showed Grandma her new terrarium, she was so
A.arm | B.back | C.leg | D.head |
A.rest | B.read | C.drink | D.work |
A.waiting for | B.depending on | C.looking at | D.getting ready for |
A.dream | B.idea | C.question | D.story |
A.hidden | B.hung | C.grown | D.tied |
A.so | B.after | C.but | D.because |
A.her | B.his | C.their | D.our |
A.beginning | B.gift | C.chance | D.task |
A.borrow | B.choose | C.buy | D.build |
A.hard | B.dirty | C.hot | D.wet |
A.two | B.three | C.four | D.five |
A.expensive | B.colourful | C.traditional | D.personal |
A.Finally | B.However | C.Instead | D.Still |
A.afraid | B.pleased | C.nervous | D.worried |
A.flower | B.bottle | C.picture | D.garden |
A.to go out | B.not to go out |
C.to not go out | D.not going out |
It’s the first day of new term. Miss Wang gets the class play a
Everyone runs quickly to
Miss Wang says: “We are always busy getting happiness. But we don’t know
A.lesson | B.game | C.class | D.sport |
A.all | B.both | C.each | D.either |
A.hobbies | B.ages | C.numbers | D.names |
A.brings | B.takes | C.sells | D.wants |
A.take out | B.put out | C.find out | D.look out |
A.ask for | B.pay for | C.wait for | D.look for |
A.everybody | B.anybody | C.nobody | D.somebody |
A.difficult | B.easy | C.interesting | D.relaxing |
A.time | B.date | C.hour | D.morning |
A.has | B.calls | C.writes | D.plays |
A.surprised | B.happy | C.creative | D.interested |
A.on | B.at | C.with | D.for |
A.finish | B.lose | C.start | D.have |
A.which | B.what | C.where | D.when |
A.loudly | B.easily | C.hardly | D.carefully |
China’s Mars rover(火星车) Zhurong, named after the Chinese god of fire, landed safely on Mars on May 15, making China only the second behind the United States to fully succeed.
The 240-kilogram, six-wheeled rover is equipped with six scientific instruments, giving it the appearance of a “blue butterfly”. Unlike Perseverance, the American Mars rover, Zhurong needs sunlight to power itself. Now that Zhurong has got down successfully, it is expected to take the next 90 days to map the area on Mars, monitor(监测) changes in weather such as temperature and search for signs of water ice. Zhurong will therefore help build a more complete geological picture of the red planet’s history.
China has successfully landed on the moon three times, and has even brought back lunar rocks to Earth. But landing on Mars is even more difficult. Mars exploration is known for its high risks and difficulties, as well as the uncertainties in the long-distance interstellar(星际) fight. The landing is the most challenging part of it. Around half of Mars exploration missions(探索任务) failed, and most of them went wrong in the landing process. A Mars landing is often considered as “the seven minutes of terror” because the process is completely autonomous. “The distance was too far away for the spacecraft so it has to do it all on its own,” said Chen Lan, a scientist in China’s space program. “If something went wrong, people on earth have no way to help.”
“Mars is the planet in our solar system that we are most likely to live in the future. That’s why we want to understand it.” Ge said. “The success of Zhurong’s landing will lay the foundation for future Mars missions, including a sample return mission in 2030.”
1.According to the passage, Zhurong Rover looks like ________.A.![]() | B.![]() | C.![]() | D.![]() |
A.map the Mars | B.study the weather |
C.change the temperature | D.look for water ice |
A.self-directed | B.trusted | C.man-controlled | D.prepare |
A.history | B.process | C.distance | D.challenge |
A.the American rover is powered like Zhurong |
B.the mission of Zhurong will last about 3 months |
C.few Mars exploration missions succeed |
D.we are possible to move to Mars in 2030 |